Segment Information - Schedule of Segment Total Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total Assets	$ 3,079,476	$ 3,011,137
Financial Advisory [Member]
Segment Reporting Information [Line Items]
Total Assets	723,987	714,708
Asset Management [Member]
Segment Reporting Information [Line Items]
Total Assets	596,955	612,018
Corporate [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 1,758,534	$ 1,684,411